Phosphating treatment is widely used pretreatment technology, a kind of chemical layer converting process. Such process are mainly used as the surface treatment for steel castings and iron castings. Sometime, they are also used for the ferrous metal castings, such as aluminium die castings or zinc castings.
Below are the processes for the phosphating treatment,
*Finish treatment, such as electrophoresis or powder coating
According to the tempurture control, thhere are several phosphating treatment types.
*High temperature phosphating
*Midium temperature phosphating
*Low temperature phosphating
*Normal temperature phosphating
Application for the phosphating treatment,
*Strength the binding force between the painting layer and the products.
*Increase the corrosion resistance of the casting surface
*Better the decorative surface of the casting
Several factors effect the phosphating treatment,
*Surface condition of the castings
*Preparation for phosphating